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3. A battery producer claimed that the mean lifetime of a batter).r produced by his factory was 30 hours. A competitor thought that the gure
3. A battery producer claimed that the mean lifetime of a batter).r produced by his factory was 30 hours. A competitor thought that the gure was too high and took eight batteries at random and later found that the lifetime of each battery was: Lifetime {hours} 15 28 33 24 28 25 31 2'? Test the battery producer's claim at u. = 0.05
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